机器加工场夸大机器加工要知足必然的紧密度，是指钢件在机器加工后的现实上多少图形首要参数与整机图纸所请求的抱负化值的相分歧的程度。而他们中间不相分歧的程度，则称之为出产加工误差。

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抱负化的多少图形首要参数，对规格来说，是说均值规格；对表层多少图形模样来说，是说的圆、圆柱体、立体图、球面战争行线等；对表层中间的相互部位来说，是说的平行面、竖直、同轴输入、对称性等。

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